Area52 escribió:N.B Algun listillo te dirà que el modo normal es sin bloqueo y modo AVCS es con bloqueo, no le hagas caso... en los dos modos el gyro te bloquea la cola pero en modo normal se queda en su sitio y en modo AVCS regresa a su posición de inicio.
Precisamente por eso se llama AVCS (Angular Vector Control System)
Porque corrige la cola, osea, modo bloqueo
Salu2.
Un poco de culturilla...
Differences Between AVCS Gyro and Conventional Gyro:
Compared to a convention gyro, the AVCS gyro has a substantially improved
tail control capacity. Gyro operation also differs from that of
conventional systems in a number of ways.
The following sequentially describes the conventional gyro and the AVCS
gyro.
Conventional gyro:
The conventional gyro detects movement of the helicopter's tail and controls
the rudder servo so that movement of the tail stops.
Now, consider hovering when the helicopter is exposed to a side wind, the
tail drifts. When the tail drifts, the gyro detects the tail rotation angular
velocity and operates the servo in the direction that stops the tail from
moving. Drifting of the tail is stopped by control from the gyro. When the
tail stops drifting, the control amount from the gyro becomes zero. Since the
helicopter is always exposed to side wind, even in this state, the tail starts to
drift again. When the tail drifts, the gyro tries to stop it again. The "drifting
stop" operation is repeated and the tail continues to drift in the wind
direction in this manner. The higher the gyro sensitivity, the smaller the
amount of this drift. However, if the sensitivity is high, hunting will occur
and, therefore, the sensitivity amp has a limit.
AVCS gyro:
This following describes how the AVCS system works when the helicopter
is exposed to a side wind while hovering, the same as the preceding item.
When the helicopter is exposed to a side wind, the tail begins to drift. The
gyro controls the servo so that the movement of the tail stops, the same as a
conventional gyro. At the same time, a sensor is controlled so that the tail is
rotated in the opposite direction (returns to the original position). In short,
the conventional gyro performs an operation known as "drifting stop", but
the AVCS system performs an operation that "stops drifting and returns to
original position". The "return to original position" operation added to the
AVCS system improves rudder trim operation. In other words, the gyro can
automatically trim the rudder against side winds. This also applies to reverse
flight. When a helicopter is flying in the forward and reverse directions, the
rudder trim is changed to advance, but with the AVCS system, this trim
change is performed automatically and instantaneously so that the tail
remains extremely stable even during high-speed reverse flight.
Differences in rudder control method:
The following describes the differences between conventional gyro and
AVCS gyro rudder control.
The conventional gyro sends the rudder control signals from the transmitter
to the rudder servo and starts to move the tail. When the tail moves, the gyro
detects this movement and generates a signal to stop it. If the tail continues
to move even in this state, a rudder control signal larger than the signal from
the gyro must be applied from the transmitter. That is, the difference
between the rudder control signal from the transmitter and the control signal
that attempts to stop this from the gyro becomes the actual amount of
movement of the tail. Ordinarily, the rudder control signal is amplified
several times over by the gyro amp and is balanced with the gyro control
signal so that the transmitter can be used at the normal steering angle.
The AVCS system uses a different rudder control method. As described in
the preceding section, it has additional functions that "attempt to return
movement by external force to the original position" and that generate an
angular velocity proportional to the rudder control signal. That is, it functionally
controls the speed of rotation of the tail. The original AVCS
(Angular Vector Control System) came from this.
•In the AVCS mode, when the transmitter rudder stick is moved when
the helicopter was stopped, the rudder servo controls operation until
the tail reaches the specified rotational speed.
•Trim deviation of the rudder control signal also becomes a signal that
causes the tail to turn so that even a little trim deviation causes the
tail to move. Therefore, the rudder trim is made the same in all flight
states and must match the neutral reference signal at the gyro. The
method of reading the rudder neutral signal at the gyro will be
described separately.
•Since the rudder mixing signals from the transmitter also become a
tail rotation signal, all the rudder mixing functions must be disabled.
•In the AVCS mode, the gyro automatically trims the rudder so that
linkage changes cannot be verified. Initially, the GYRO trims the
rudder by flying in the Normal mode to take the rudder linkage neutral
position. This centers the linkage. At this time, this rudder neutral
reference point is read to the GYRO.
Giving the gyro the rudder neutral reference signal and performing
tail operation by referring to this signal in the AVCS mode in this
way is how the AVCS system differs from the conventional system.
Ahi es naaaa
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